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Messe I.X-VI.X is the ninth studio album by the Norwegian experimental collective Ulver and the Tromsø Chamber Orchestra with additional aid from composer Martin Romberg. Written and produced by Ulver, released on October 8, 2013, via Jester Records and Kscope. The album has been described as a "peace mass for Lebanon".

On September 17, 2013, a trailer was released, and on October 4, 2013 the track "Shri Schneider", was released for streaming via Pitchfork Media.

The music was commissioned in 2012 by the Tromsø Kulturhus (House of Culture) in Norway, in a cooperation with the Arctic Opera and Philharmonic Orchestra cultural institution. It was composed and first performed live by Ulver, alongside the Tromsø Chamber Orchestra on September 21, 2012. The band then took the recordings back to Crystal Canyon, Oslo and spent winter and spring in post-production, honing the material for its studio-equivalent.

Six compositions altogether written and produced, recorded and mixed by Ulver, this time consisting of Ole Alexander Halstensgård, Kristoffer Rygg, Jørn H. Sværen and Tore Ylwizaker, with additional aid and advice from composer Martin Romberg who also arranged the music for the 21 members of Tromsø Chamber Orchestra. The album also features contemporary composers/musicians Ole-Henrik Moe and Kari Rønnekleiv.

The band named some of their influences for Messe I.X–VI.X:

Gorecki's No. 3: Symphony of Sorrowful Songs. It haunted us for years and probably always will. The Gustavs Mahler and Holst. Sound collages from When or Nurse with Wound. 70's kraut and synth. Ash Ra and Autobahn. 80’s pop scores. John Carpenter and Tin Drum. Terry Riley, again and again and again. Saint John of the Cross.

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